菜單、畫筆、畫刷的使用

• 設定菜單項為選中狀态

HMENU hMenu; hMenu = GetMenu(); CheckMenuItem(hMenu, ItemSelection, MF_UNCHECKED); ItemSelection = LOWORD(wParam); CheckMenuItem(hMenu, ItemSelection, MF_CHECKED);

• 設定菜單為（不）可用狀态

EnableMenuItem(hMenu, IDM_EDIT_UNDO, MF_GRAYED); EnableMenuItem(hMenu, IDM_EDIT_UNDO, MF_ENABLED);

• 處理paint消息時，取得裝置内容句柄

BeginPaint(); EndPaint();

• 處理非paint消息時，取得裝置内容句柄

HDC hdc; hdc = GetDC(hwnd); ReleaseDC(hwnd, hdc);

• 獲得現有畫筆句柄

HPEN hPen;

hPen = GetStockObject(WHITE_PEN);

SelectObject(hdc, hPen);

• 畫筆的建立、選擇、删除

hPen = CreatePen(PS_SOLID, 3, RGB(255, 0, 0));

SelectObject(hdc, hPen);

DeleteObject(hPen);

• 獲得現有畫刷句柄

HBRUSH hBrush;

hBrush = GetStockObject(NULL_PEN);

SelectObject(hdc, hPen);

• 建立邏輯畫刷

hBrush = CreateSolidBrush(RGB(0, 255, 0));

SelectObject(hdc, hBrush);

DeleteObject(hBrush);

• 重新整理視窗

RECT rect;

GetClientRect(&rect);

InvalidateRect(hwnd, &rect, true);

UpdateWindow(hwnd);